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-/* ChannelBinding.java -- a channel binding in the GSS-API.
- Copyright (C) 2004 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-/* The documentation comments of this class are derived from the text
- of RFC 2853: Generic Security Service API Version 2: Java Bindings.
- That document is covered under the following license notice:
-
-Copyright (C) The Internet Society (2000). All Rights Reserved.
-
-This document and translations of it may be copied and furnished to
-others, and derivative works that comment on or otherwise explain it
-or assist in its implementation may be prepared, copied, published and
-distributed, in whole or in part, without restriction of any kind,
-provided that the above copyright notice and this paragraph are
-included on all such copies and derivative works. However, this
-document itself may not be modified in any way, such as by removing
-the copyright notice or references to the Internet Society or other
-Internet organizations, except as needed for the purpose of developing
-Internet standards in which case the procedures for copyrights defined
-in the Internet Standards process must be followed, or as required to
-translate it into languages other than English.
-
-The limited permissions granted above are perpetual and will not be
-revoked by the Internet Society or its successors or assigns.
-
-This document and the information contained herein is provided on an
-"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
-TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
-NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN
-WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
-MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. */
-
-
-package org.ietf.jgss;
-
-import java.net.InetAddress;
-import java.util.Arrays;
-
-/**
- * <p>The GSS-API accommodates the concept of caller-provided channel
- * binding information. Channel bindings are used to strengthen the
- * quality with which peer entity authentication is provided during
- * context establishment. They enable the GSS-API callers to bind the
- * establishment of the security context to relevant characteristics
- * like addresses or to application specific data.</p>
- *
- * <p>The caller initiating the security context must determine the
- * appropriate channel binding values to set in the {@link GSSContext}
- * object. The acceptor must provide an identical binding in order to
- * validate that received tokens possess correct channel-related
- * characteristics.</p>
- *
- * <p>Use of channel bindings is optional in GSS-API. Since channel-binding
- * information may be transmitted in context establishment tokens,
- * applications should therefore not use confidential data as
- * channel-binding components.</p>
- */
-public class ChannelBinding
-{
-
- // Fields.
- // -------------------------------------------------------------------------
-
- private final byte[] appData;
- private final InetAddress initAddr;
- private final InetAddress acceptAddr;
-
- // Constructor.
- // -------------------------------------------------------------------------
-
- /**
- * Create a ChannelBinding object with user supplied address information
- * and data. <code>null</code> values can be used for any fields which the
- * application does not want to specify.
- *
- * @param initAddr The address of the context initiator. <code>null</code>
- * value can be supplied to indicate that the application
- * does not want to set this value.
- * @param acceptAddr The address of the context acceptor. <code>null</code>
- * value can be supplied to indicate that the application
- * does not want to set this value.
- * @param appData Application supplied data to be used as part of the
- * channel bindings. <code>null</code> value can be
- * supplied to indicate that the application does not
- * want to set this value.
- */
- public ChannelBinding(InetAddress initAddr, InetAddress acceptAddr,
- byte[] appData)
- {
- this.appData = (appData != null) ? (byte[]) appData.clone() : null;
- this.initAddr = initAddr;
- this.acceptAddr = acceptAddr;
- }
-
- /**
- * Creates a ChannelBinding object without any addressing information.
- *
- * @param appData Application supplied data to be used as part of the
- * channel bindings.
- */
- public ChannelBinding(byte[] appData)
- {
- this(null, null, appData);
- }
-
- // Instance methods.
- // -------------------------------------------------------------------------
-
- /**
- * Returns the initiator's address for this channel binding.
- * <code>null</code> is returned if the address has not been set.
- *
- * @return The initiator's address, or <code>null</code>.
- */
- public InetAddress getInitiatorAddress()
- {
- return initAddr;
- }
-
- /**
- * Returns the acceptor's address for this channel binding.
- * <code>null</code> is returned if the address has not been set.
- *
- * @return The acceptor's address, or <code>null</code>.
- */
- public InetAddress getAcceptorAddress()
- {
- return acceptAddr;
- }
-
- /**
- * Returns application data being used as part of the ChannelBinding.
- * <code>null</code> is returned if no application data has been
- * specified for the channel binding.
- *
- * @return The application data, or <code>null</code>.
- */
- public byte[] getApplicationData()
- {
- if (appData != null)
- return (byte[]) appData.clone();
- return null;
- }
-
- /**
- * Returns <code>true</code> if two channel bindings match.
- *
- * @param obj Another channel binding to compare with.
- * @return True if this channel binding equals the other.
- */
- public boolean equals(Object obj)
- {
- if (!(obj instanceof ChannelBinding))
- return false;
- ChannelBinding cb = (ChannelBinding) obj;
- boolean b1 = Arrays.equals(appData, cb.appData);
- boolean b2 = (initAddr == null && cb.initAddr == null)
- || (cb.initAddr != null && initAddr.equals(cb.initAddr));
- boolean b3 = (acceptAddr == null && cb.acceptAddr == null)
- || (cb.acceptAddr != null && acceptAddr.equals(cb.acceptAddr));
- return b1 && b2 && b3;
- }
-
- /**
- * Returns the hash code for this channel binding.
- *
- * @return The hash code.
- */
- public int hashCode()
- {
- int code = 0;
- if (appData != null)
- for (int i = 0; i < appData.length; i++)
- code ^= appData[i] << ((8 * i) & 31);
- if (initAddr != null)
- code ^= initAddr.hashCode();
- if (acceptAddr != null)
- code ^= acceptAddr.hashCode();
- return code;
- }
-}
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